26" x 30" or 30" x 26" Cube Core Eggcrate Return Air Grille d + Product Details Size –

+ Product Details Size – 24" x 36" or 36" x 24" is the size for the duct opening measurement only

+ Product Details Size - 28"w X 24"h is the size for the duct opening measurement only

Ideal for Walls & Ceilings: Designed for seamless installation in standard 18" X 18" duct openings

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actual front end outer dimensions are approximately 16 5/8" width X 36 5/8" height

26" x 30" or 30" x 26" Cube Core Eggcrate Return Air Grille d + Product Details Size –+ Product Details Size 26" x 30" or 30" x 26" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 27. 75" X 31. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing